AusBonsai has a limit of 1MB per image, so we all must reduce our image's size before attaching to a thread.A good all round file size for images is around 500KB.A simple free app for resizing images is 'Image Resizer'. Once loaded onto your phone / computer it's as simple as right clicking on the image, select Image Resizer, then select a size around 800px x 600px.On a Windows PC i generally use Paint. Either will work fine.

Those short, close packed needles look a bit like Pinus mugho but I think there are some short needle varieties of both scots and black pine. A look at the bark may help differentiate. I would also like to look at the soil and roots to see what you mean by

It is completely root bound and I can hardly see any soil in the pot as it has been neglected for a very long time

My guess, with so little to go on, is that it is starving. What fertiliser regime have you had it on (what sort, how often)Not enough water could also cause yellow needles. Plants that are very root bound can be extremely difficult to water properly. The water just will not penetrate into the centre of the root ball and even though you think you are watering well the tree stays a bit too dry.Root problems can also cause yellowing of needles. If it has been too wet some roots may have rotted. If it will slip out of the pot easily you can check the colour of roots. It is nearly time for repotting so you can solve the root bound and any other root problems then.Another possibility would be not enough sun. I think pines should probably be in as much sun as possible at this time of year in most places.

Lots of possibilities I know but without further info or investigation it is hard to eliminate any of these.

shibui wrote:Those short, close packed needles look a bit like Pinus mugho but I think there are some short needle varieties of both scots and black pine. A look at the bark may help differentiate. I would also like to look at the soil and roots to see what you mean by

It is completely root bound and I can hardly see any soil in the pot as it has been neglected for a very long time

My guess, with so little to go on, is that it is starving. What fertiliser regime have you had it on (what sort, how often)Not enough water could also cause yellow needles. Plants that are very root bound can be extremely difficult to water properly. The water just will not penetrate into the centre of the root ball and even though you think you are watering well the tree stays a bit too dry.Root problems can also cause yellowing of needles. If it has been too wet some roots may have rotted. If it will slip out of the pot easily you can check the colour of roots. It is nearly time for repotting so you can solve the root bound and any other root problems then.Another possibility would be not enough sun. I think pines should probably be in as much sun as possible at this time of year in most places.

Lots of possibilities I know but without further info or investigation it is hard to eliminate any of these.

Neil it could be a varient. Ive got a black pine in the garden that has been propagated to have yellow needles. Now if it originally a healthy green colour before and now yellow id be concerned.

Here’s a couple pictures of the pine.Would love to know what species it is.

That looks exactly like the one in a pot in my backyard which I bought from bunnings four years ago as a mugo pine Amber gold and it turns yellow depending on the severity of the winter and then back to green. I wouldn’t be too concerned but then again that’s my only pine